# CVE-2021-34523

> Microsoft Exchange Server Elevation of Privilege Vulnerability

- **CVSS:** 9 (CRITICAL)
- **EPSS:** 94.0%
- **CISA KEV:** yes (known ransomware use)
- **CWE:** NVD-CWE-noinfo

Canonical: https://intel.threadlinqs.com/cve/CVE-2021-34523
Full threat coverage + IOCs via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp